A digital watermark in a data file occurs at multiple locations within the file. The flat multilayered component contains a layer of electrically activatable material, a passive middle layer disposed adjacent the layer of electrically activatable material, and a further passive material layer disposed adjacent the passive middle layer. A second sealing material is provided on at least one of a lower surface and a peripheral side surface of the semiconductor substrate, a total impurity concentration of an Na ion, a K ion, a Ca ion and a Cl ion contained in the second sealing material being not smaller than 100 ppm.